The Undeniable Joy of Letters: How writing them makes me a better writer (plus, letter-related playlist!)

My friend Peter and I communicate in lots of different ways. We text, we use desktop chat services, we sometimes Skype, we call each other on the phone, and we even meet up in person from time to time. (Peter lives in New Jersey, and I live in California.)

But on top of all that, Peter and I also write letters to each other. Why do two friends who already communicate so frequently need yet another method of communication?